Bertech ESD Soldering Mat has two layers: The top one is a blue static dissipative rubber layer laminated to a black conductive rubber bottom layer. Resistance-to-Ground is 8 x 10e6-8 & Point-to-Point Resistance is 2 x 10e6-8. This soldering mat offers excellent resistance to oil, grease, and most common solvents. It is very light compared to our single layer and three layer mats. It is heat and solder resistant. It will not delaminate, and is easy to clean. RoHS and REACH Compliant.